Stereospecific Synthesis of 2-Deoxy-2,2-difluororibonolactone and Its Use in the Preparation of 2′-Deoxy-2′,2′-difluoro-β-D-ribofuranosyl Pyrimidine Nucleosides: The Key Role of Selective Crystallization
作者:T. S. Chou、P. C. Heath、L. E. Patterson、L. M. Poteet、R. E. Lakin、A. H. Hunt
DOI:10.1055/s-1992-26167
日期:——
A stereospecific synthesis of 2′-deoxy-2′,2′-difluorocytidine (gemcitabine), a potential anticancer agent, is described. The stereoselectivity was accomplished via two diastereoselective crystallizations, i. e. the crystallization of the key intermediate, difluororibonolactone 2a, and the crystallization of the hydrochloride salt of gemcitabine 16b from the anomeric mixture. Because of the availability of 2a in large quantities, other 2′-deoxy-2′,2′-difluoropyrimidine nucleosides such as 2′-deoxy-2′,2′-difluorouridine (19) were synthesized for structure-activity relationship studies.
本文描述了潜在抗癌药物2′-脱氧-2′,2′-二氟胞苷(吉西他滨)的立体特异性合成。通过两次非对映选择性结晶实现了立体选择性:即关键中间体二氟乳糖内酯2a的结晶,以及从异头混合物中结晶出吉西他滨的盐酸盐16b。由于2a可以大量获得,因此合成了其他2′-脱氧-2′,2′-二氟嘧啶核苷,如2′-脱氧-2′,2′-二氟尿苷(19),用于结构-活性关系研究。